diff --git a/image_analysis/image_preprocessing/ImagePreprocessorBuffer.h b/image_analysis/image_preprocessing/ImagePreprocessorBuffer.h
index 5048571d..f380ca1d 100644
--- a/image_analysis/image_preprocessing/ImagePreprocessorBuffer.h
+++ b/image_analysis/image_preprocessing/ImagePreprocessorBuffer.h
@@ -1,11 +1,11 @@
 // SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
 // SPDX-License-Identifier: GPL-3.0-only
 
-
 #pragma once
 
 #include <vector>
 #include <cstdint>
+#include <cstddef>
 
 class ImagePreprocessorBuffer {
 protected: